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2481 = 3827

2481 has 4 divisors (see below), whose sum is σ = 3312. Its totient is φ = 1652.

The previous prime is 2477. The next prime is 2503. The reversal of 2481 is 1842.

2481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2481 - 22 = 2477 is a prime.

It is a super-2 number, since 2×24812 = 12310722, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is a plaindrome in base 9 and base 13.

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 2481.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 2481.

It is not an unprimeable number, because it can be changed into a prime (2411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 411 + ... + 416.

It is an arithmetic number, because the mean of its divisors is an integer number (828).

2481 is the 32-nd centered pentagonal number.

It is an amenable number.

2481 is a deficient number, since it is larger than the sum of its proper divisors (831).

2481 is an equidigital number, since it uses as much as digits as its factorization.

2481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830.

The product of its digits is 64, while the sum is 15.

The square root of 2481 is about 49.8096376216. The cubic root of 2481 is about 13.5376179875.

It can be divided in two parts, 24 and 81, that added together give a triangular number (105 = T14).

The spelling of 2481 in words is "two thousand, four hundred eighty-one".

Divisors: 1 3 827 2481